Watchmaker&#39;s gage.



J. H. MARTIN. WATGHMAKEIVS GAGE.

APPLICATION FILED JUNE 12, 1912.

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Patent ed June 30, 1914.

UNITED STATES PATENT OFFTC.

JOSEPH H. MARTIN, 0F 'ELGIN, ILLINOIS.

WATGHMAKERS GAGE.

To all whom it may concern Be it known that I, JosErI-i H. MARTIN, acitizen of the United States, and a resident of the city of Elgin,county of Kane, and State of Illinois, have invented certain new anduseful Improvements in \Vatchmakers Gages, of which the following is aspecification.

My invention relates to watch makers gages, andmore specifically toimprovements in balance wheel truing devices adapted for use by watchmakers in effecting the truing of balance wheels of watches.

The object of my invention is the production of a gage of the charactermentioned through the medium of which a balance wheel may be readily andexpeditiously adjusted and in which various adjustments will be afiordedso as to adapt the device for use in conjunction with balance wheels ofvarious dimensions.

A further object is the production of a device, as mentioned, which willbe durable and economical in construction and efficient in operation.

Other objects will appear hereinafter.

With these objects in view, my invention consists in the combinationsandarrangements of parts, all as will be hereinafter described and claimed.

The invention will be best understood by reference 'to the accompanyingdrawing forming a part of this specification, and in which- 7 Figure 1is a front elevation of a gage embodying my invention, Fig. 2 is anenlarged section taken on line c0m of Fig. 1, Fig. 3 is a fragmentarysection taken on sub stantially line Qf-gf of Fig. 2, Fig. 1 is anenlarged section taken on line z*e* of Fig. 1, Fig. 5 is an enlargedperspective view of the gage-finger of the device, detached,.

Fig. 6 is an enlarged perspective view of the gage finger supportingmember detached, Fig. 7 is an enlarged fragmental de tail of the gage.

The preferred form of construction, as illustrated in the drawingcomprises a caliper consisting of pivotally connected members or leverswhich are formed to constitute cooperating clamping jaws 1 and 1 at therespective ends thereof. The outer ends of the jaws 1 and 1 are providedwith bearings or journals 2 between which is adapted to be rotatablymounted the balance wheel 2 which it is desired to true.

Specification of Letters Patent. Patqgnted J 11113 3Q 1914 Applicationfiled June 12, 1912.

Serial No. 703,152.

Provided at one end of the caliper is a bar 3 one end of whlch ispivotally secured by means of a screw 4: to the corresponding jaw 1, thejaw lat the opposite end of the caliper being provided -Witl'l athreaded socket 1 in order to accommodate said bar if it is desired tomount the same upon the opposite end of the caliper, the opposite endsof the caliper, being adapted in practice to accommodate balance wheelshaving spindles of different forms or sizes. A screw 5 cooperates withthe screw 1, to serve as a means of locking the latter in position, asclearly shown in Fig. 2. The screw at, in use, will be so adjusted as toexert a pressure upon the bar 3 sufficient to hold said bar in positionsof angular adjustment to which the same may be-moved by the fingers inoperating the device. 1

Mounted upon the front side of the bar 8 is a supporting member 6, thesame being secured to said bar by means of a screw 7,

.a nut 7 and washer 8 so as to permit of rotary adjustment of saidmember, an elongated slot 9 provided in the bar 3 for engagement by saidscrew and nut permitting of adjustment of said supporting memberlongitudinally of said bar. The opposite sides of the nut 7 areflattened, as at 10 for-engagement with the opposite sides of slot 9which thereby serve as a means of preventing relative rotary movement ofsaid nut during the adjustment of the screw ,7 therein.

One end of the supportingmember 6 is bifurcated, for the support of thegagefinger 11, the rearward end of which is pivotally mounted betweenthebranches 6 of said supporting member. A screw 12 proj ects through thebranches 6 and the corresponding end of finger 11 for pivotallyconnecting the latter with the supporting member, said screw passingloosely through one of the branches 6 and the finger 11 and beingthreaded in the other of said branches so that by adjusting said sore-W,clamping of the gage-finger between the branches 6 may be effected so asto frictionally hold said finger in position of adjustment.

l Vith a construction as set forth, it will be seen that a variety ofadjustments is afforded so as to permit of the gage-finger beingadjusted to any position desired in effecting the truing of the balancewheel positioned in the caliper. The various parts are frictionally heldin positions of adjustment so that the same will yield to manualpressure and permit of ready and expeditious adjustment during operationof the device. The construction is such that the friction may beincreased at any or all of the points so as to take up wear, or tosecure any friction suitable to the individual convenience of theoperator. The outer end of the gage-finger 11 is concave, as at 13, soas to conform with the convex curvature of the periphery of the balancewheel.

At a right angle to curved surface 13 is a plane edge portion on gagefinger 11 parallel with the plane sides of balance wheel 2. Finger 11 isdisposed with relation to the balance wheel so that the corner of curvedsurface 13 and the plane edged portion of said finger is spaced veryclose to and parallel with the corner between the periphery and oneplane side of said balance wheel. Obviously, with this arrangement thebal ance wheel may be gaged for its being true both as to itsconcentricity and its being perpendicular with its shaft, see Figs. 1and 7.

The device is du able and economical in construction, and will be foundhighly efficient in use.

While I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariation and modification without departing from the spirit of theinvention. 1, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaims.

l-laving described my invention what I claim as new and desire to secureby Letters Patent is:

1. In a device of the class described, a pair of pivotally connectedjaws provided with cooperating bearings at the ends of said jaws; a barpivotally mounted upon one of said jaws; a gage-linger supporting membermounted for longitudinal and rotary adjustment upon said bar; and agage-linger mounted for rotary adjustment in said supporting member,substantially as described.

ed tor rotary adjustment in said bifurcated 2. In a device of the classdescribed, a pair of pivotally connected jaws provided with cooperatingbearings at the ends of said jaws; a bar pivotally mounted upon one ofsaid jaws; a gage-finger supporting member mounted for longitudinaladjustment upon said bar; one end of said supporting member beingbifurcated; and a gage-finger having its rearward end mountend of saidsupporting member, substan tially as described.

3. In a device of the class described, a pair of pivotally connectedjaws provided with cooperating bearings at the ends of said jaw a barpivotally mounted upon one of said jaws; a gage-finger supporting membermounted for longitudinal and rotary adjustment upon said bar; meanspassing through said bar and engaging an elongated longitudinallyextending slot provided in said bar for :t'rictionally holding saidsupporting member in positions of adjustment upon said bar; and agagedinger carried by said supporting member, substantially asdescribed.

at. In a device of the class described, a pair of pivotally connectedjaws provided with cooperating bearings at the ends of said jaws; a barpivotally mounted upon one of said jaws; a gage-finger supporting membermounted for longitudinal adjustment upon said bar; one end of saidsupporting member being bifurcated; a gagelinger having its rearward endmounted for rotary adjustment in said bifurcated end of said supportingmember; and adjustable means passing through the arms of said hifurcatedend of said supporting member and said end of said finger for clampingsaid finger between said arms, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOSEPH H. MARTIN.

Witnesses Josnna R. H. Po'r'rs, J. SIMONS.

Eunice of this patent may be obtained for five cents each, by addressingthe Commissioner of latents, Washington, D. 0.

